96—ELECTRICAL SYSTEM
CHRYSLER SERVICE MANUAL
when battery equals or exceeds 1.225 specific
gravity at 80 degrees F.
Connect a carbon pile rheostat in series with
an ammeter and battery, (Fig. 2). Be sure the
carbon pile control knob is rotated to full re-
sistance position before connecting. The volt-
meter clips must contact battery posts only and
not the high rate discharge tester clips. Unless
this is done, the actual battery terminal voltage
will not be indicated. Rotate carbon pile control
knob until 200 amperes register on the meter.
With battery under discharge for approximate-
ly 15 seconds, read terminal voltage. If terminal
voltage shows 9.5 volts or more, battery has
good output capacity.
2.
CHARGING THE BATTERY
a. Slow Charging
NOTE
Slow charging is recommended wherever pos-
sible.
The slow chargers commonly used in service
stations are suitable for charging both 6 and
12-volt batteries on the same circuit. Each 12-
volt unit must be considered as equal to two 6-
volt batteries, and charging rate must be ad-
justed to suit the smallest 12-volt battery on
the line. Safe slow charging rates are deter-
mined by allowing one ampere per positive
plate per cell. The proper slow charging rate
for an 11 plate battery is five amperes.
Connect (positive -f) charger lead to positive
terminal and negative (—) charger lead to neg-
ative terminal of battery. If several batteries
are to be charged in same circuit, due to charg-
ing voltage supply, batteries are connected in
series for required number per circuit.
As batteries approach full charge, each cell
will begin to gas or bubble freely. The battery
temperature should not exceed 125 degrees F.
during charge. If this temperature is reached,
the battery should be cooled by reducing charge
rate or removed from circuit. The battery is
fully-charged when three successive hourly hy-
drometer readings show no rise in specific
gravity.
b.
Slow Charging Batteries to Remove Sulphation
To condition a battery that is sulphated, charge
battery for minimum of 24 hours at a maximum
500 AMPERE
CARBON PILE RHEOSTAT
0 TO 300 AMPERE METER
V
NEGATIVE GROUND
Fig.
2—Test Connections for Battery Capacity Test
56x78
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